Admittedly, it was a tough decision for the six-year NHL veteran to make.
"It's never easy to say no to Hockey Canada. You never know how many chances you're going to get," said Gallagher. "I went the one time and had an awesome experience. We were able to win. That's a memory that I'm pretty proud of, but I think first and foremost my obligations are to the Montreal Canadiens and you've got to take care of your body and make sure that you're ready to go 100 percent next year."
While he won't be making the trip with his fellow countrymen, the Edmonton native will still be paying close attention to the way things play out overseas.
"Going to play in the Worlds is a really positive experience. Anybody who went, just ask them," said Gallagher, the Canadiens' leading goal-scorer and point-getter during the 2017-18 campaign. "The guys that are going, I'll watch and cheer for them, and hopefully they bring back the gold."
Like Gallagher, Carey Price declined his invitation from Hockey Canada, too.
"I'm not going to be going. I'm going to spend time with my family," confirmed Price. "It's going to be a good summer to reset for sure."